1.Name one situation where the acceleration of an object is in a different direction than the velocity of object.2.If you are jumping,why is it a good idea to bend your knees when you land?(use impulse to explain)3.The chemical compound SiCl₄ (
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1.Name one situation where the acceleration of an object is in a different direction than the velocity of object.2.If you are jumping,why is it a good idea to bend your knees when you land?(use impulse to explain)3.The chemical compound SiCl₄ (
1.Name one situation where the acceleration of an object is in a different direction than the velocity of object.
2.If you are jumping,why is it a good idea to bend your knees when you land?(use impulse to explain)
3.The chemical compound SiCl₄ (one silicon atom bonded with four chlorine atoms) is a colorless liquid.Which of the following would you expect to have similar chemical properties,and why?
(A) SiBr₄(one silicon atom bonded with four bromine atoms);
(B) PCl₄(one silicon atom bonded with four tellurium atoms.)
(4) An atom has 17 protons,18 neutrons and 18 electrons.Write the element,mass number and ionization state( for example:⁴He2⁺)
1.Name one situation where the acceleration of an object is in a different direction than the velocity of object.2.If you are jumping,why is it a good idea to bend your knees when you land?(use impulse to explain)3.The chemical compound SiCl₄ (
1、指出一种物体的加速度和速度方向不一致的情况.（答：曲线运动）
2、当你跳跃时,为什么着地的时候最好屈膝?（用冲量来解释）
3、化合物SiCl4（一个硅原子被四个 氯原子包围）是一种无色液体,你认为下列哪种物质具有与之相似的化学性质?为什么?
A) SiBr₄(一个硅原子被四个溴原子包围);
(B) PCl₄(一个磷原子被四个 氯原子包围）
4、一个原子有17个中子、18个质子和18个电子,写出它的化学符号、质量数和电离态（例如 ⁴He2⁺）